Lozal vs water pill

Lozal and water pill both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lozal	Yes	No	No	No
water pill	Yes	No	No	No

As nouns, water pill is a hypernym of Lozal; that is, water pill is a word with a broader meaning than Lozal:

Lozal: diuretic (trade name Lozal) used in the treatment of hypertension
water pill: any substance that tends to increase the flow of urine, which causes the body to get rid of excess water

Other hypernyms of Lozal include diuretic, diuretic drug.

Lozal (noun)	water pill (noun)
diuretic (trade name Lozal) used in the treatment of hypertension	any substance that tends to increase the flow of urine, which causes the body to get rid of excess water